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Minimum Load for SN6501-Q1

Tapajit Mondal
Prodigy 160 points
Other Parts Discussed in Thread: SN6501

I intend to use SN6501 solely to power a CAN transceiver, which in Low Power modes draws only 15µA maximum and 70mA in Normal mode (dominant). Will SN6501 be able to stay in regulation under both load conditions ? How much drop in the output voltage will i see with the higher load current ?

  • 0
    TI__Mastermind 28265 points

    Hello Tapajit,

    the issue with low loads at the transformer secondary is that the transformer output voltage is undefined and could be higher than the maximum supply rating of your CAN transceiver.

    If you are using a signal isolator for your CAN transceiver, then the supply current of the isolator adds to the supply current of the CAN transceiver. The total load current might become high enough to reduce the rectifier output to an acceptable level.

    For this reasons the output characteristics of various transformers in combination with the SN6501 are shown in the data sheet. The rectifier output voltages at low loads vary slightly for a 3V-to-5V converter and a 3V-to-3V or 5V-to-5V converter.

    If however the load current should be still too low to reduce the output voltage to an acceptable level, you might add a 1k ohm resistor as minimum load, or use a shunt regulator.

    Please let me know if you have further questions or whether this helps you to continue with your project.

    best regards, Thomas